MIL-DTL-62073H(AT)
4.6.3.1.6 M1061A1 anti-lock brake system (ABS). To determine conformance to
3.5.7.2.4, the ABS shall operate on both 12v and 24v. Use of a voltage converter box to meet
the 24v operation requirement is acceptable. The ABS Electronic Control Unit (ECU) shall
include wiring provisions to transmit the trailer (cable, SAE J2394) ABS malfunction signal to
the prime mover cab. ABS systems that are used on Power Line Carrier (PLC) communication
technology to transmit ABS malfunction shall be provided. A diagnostic warning blink light
shall be mounted on an angle at the left side front of the trailer and shall be in view of truck
operator. The ABS diagnostic box shall be water proof to road splash/spray and shall be
located above fording level with easy access for maintenance.
4.6.3.1.7 Landing device. To determine conformance to 3.5.7.3, the fully loaded
trailer shall be towed to position on a 20% grade and landing device secured in a position to
support the uncoupled trailer. The prime mover shall be uncoupled and removed. The landing
device shall be operated to lower and raise the lunette to the proper coupling height. The prime
mover shall be returned and recoupled to the trailer. Except for sinking in soft terrain, any
movement of the trailer, during uncoupling, free standing, or recoupling, or any impairment of
operation of the landing device shall constitute failure of this test. The landing device shall be
examined after cross-country operation for evidence of interference with ground. Interference
with ground shall constitute failure of this test.
4.6.3.1.8 Leveling jacks. To determine conformance to 3.5.7.4, the fully loaded trailer
shall be parked on an off-road site and the leveling mechanism activated. Inability to support
the trailer or to level the trailer floor shall constitute failure of this test.
4.6.3.1.9 Trailer bolster. To determine conformance to 3.5.7.5, the reach tube,
removable components, and landing device, shall be checked for locking positions and
adjustments. Removable items shall be removed and checked for fit and interference in
stowage compartments within the frame of the trailer and for retainment during trailer towing
conditions. The parking brake shall be applied when checking the travel of the reach tube.
4.6.3.1.10 Turning ability. To determine conformance to 3.5.7.6, the prime mover
shall be coupled to the trailer and the combination shall be driven in the prime mover's minimum
turning circle to the right and left without interference between the prime mover and towed
trailer.
4.6.3.1.11 Rear-end protection. To determine conformance to 3.12, verify the rear end
protection is in compliance with 49CFR393.86, 49CFR571.223 and 49CFR571.224.
4.7 Interface verification. To determine conformance to 3.6, the appropriate prime
movers and associated trailers are to be tested for compatibility (see table II).
4.7.1 Servicing and adjusting. To determine conformance to 3.6.1, each trailer shall
be adjusted and serviced for immediate operational use, including at least the following: braking
system adjusted, electrical system checked and verified, all tires inflated to specified levels, and
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